This is a project from [Mirel] who built the system around a Arduino Mega 2560 and antipodal Vivaldi antennas, a type of directional antenna.

There is an associated Kickstarter crowd-fund. According to the Kickstarter page, the shield is known to be compatible with Uno, NerO, Leonardo and Mega 2560 Arduinos, and is though to be compatible ...

It's of course backwards compatible with existing Arduino add-ons, but sets itself apart with a new USB controller with lower latency and driver-free operation on Mac and Linux.